Thank you for responding and I hope your husband's voice will return soon.
I went to see my ENT yesterday and after the scopy looking at my vocal cords, he said my left cord is very weak just like 2 months ago without much improvement. He suggested that i wait for another three months to see any change. If not, He will refer me to another specialist for surgery or injection of collagen that may help recover some of my voice ( up to 50-70%). I feel much frustrated but nothing I can do.
Hope your husband will get his voice soon.